Fracture toughness characterisation of a glass fibre‐reinforced plastic composite

Abstract

By examining the state of the art, it can be realised that few research works have been done on the fracture behaviour of plastic composites reinforced with continuous glass fibres. Therefore, the present paper deals with the fracture toughness of a unidirectional glass fibre-reinforced plastic (GFRP), such a parameter being analytically determined by means of the modified twoparameter model (MTPM). The input data of the MTPM are obtained from an experimental campaign related to three-point bending tests on single edgenotched specimens characterised by different sizes. The novelty of this research work is that the MTPM, originally proposed for isotropic materials, is here employed to estimate the fracture toughness of GFRPs characterised by orthotropic mechanical properties.

An Assessment of ASTM E1922 for Measuring the Translaminar Fracture Toughness of Laminated Polymer Matrix Composite Materials

“…They increased the initial notch depth from ≈16 mm to ≈23 mm to avoid compression and shear failures instead of mode I translaminar fracture under cyclic loading. Vantadori et al [ 8 ] modified Jenq-Shah’s two-parameter model (MTPM) [ 9 ] to predict the fracture toughness of fiber-reinforced polymers (FRP) using three-point bend specimen according to RILEM [ 10 ]. It was found [ 8 ] that the predicted values of the fracture toughness and modulus of elasticity by MTPM are almost constant; consequently, such parameters are proved to be size-independent.…”

“…Vantadori et al [ 8 ] modified Jenq-Shah’s two-parameter model (MTPM) [ 9 ] to predict the fracture toughness of fiber-reinforced polymers (FRP) using three-point bend specimen according to RILEM [ 10 ]. It was found [ 8 ] that the predicted values of the fracture toughness and modulus of elasticity by MTPM are almost constant; consequently, such parameters are proved to be size-independent. The intrinsic and extrinsic mechanisms of mode I crack growth in FRP have been reviewed by Siddique et al [ 11 ].…”

Theoretical and numerical investigation of mode‐I delamination of composite double‐cantilever beam with partially reinforced arms

“…1 In the past several years, a large number of key mechanical components have been replaced by composites and adhesive joints; therefore, the delamination of composite laminate, which is one of the main forms of composite failure, has also received more attention. [2][3][4] Liner-elastic fracture mechanics (LEFM)5,6 and cohesive zone models (CZMs)7,8 are the two crucial theories for analyzing the delamination failure of composite laminate. Virtual crack closure technique (VCCT) and Paris' law,9 both based on LEFM, have already become well-established methods in computing the energy release rate G and predicting fatigue crack growth.10 CZM is another equally successful tool for accurately modeling delamination, 11,12 by building the relationship between traction and separation near the crack tip 13,14 and using a damage variable D to define the damage under monotonic and cyclic loading.…”

Behavior of Structural Concrete Frames with Hybrid Reinforcement under Cyclic Loading

“…High-tensile fiber stiffeners, such as carbon, glass, aramid, and basalt, are integrated into polymeric arrays and made in different shapes such as rods, grids, and tubes [3]. The characteristics of lightweight, high strength, acceptable fatigue resistance, and superior corrosion resistance also make FRP composites a major source of use as construction material or reinforcement in civil engineering [14][15][16]. FRP composite materials showed poorer elasticity and lowered bonding with concrete compared to traditional steel reinforcement.…”